| - General - |
| Geofile: | NFLD/2952 |
| Companies: | Geological Survey of Canada; Geological Survey of Newfoundland and Labrador |
| Contractor: | Fugro Airborne Surveys |
| Survey Area: | Gullbridge area, central Nfld. |
| NTS Areas: | 02D/13; 02E/04; 02E/05; 12A/16; 12H/01; 12H/08 |
| Related Geofiles: | TF: 012H/1813, NFLD/2953; Grad: NFLD/2955, 012H/1814, NFLD/2956 |
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| - Survey Logistics - |
| Survey Date: | Mar. 1 to 27, 2007 |
| Block: | Gullbridge North |
| Survey Extent: | 5284.01 line km; 1099.22 km Tie |
| Altitude: | AS350BA helicopter (C-GJIX): 40 m |
| Line Spacing: | 100 m, Az: 120°; Ties: 500 m, Az: 030° |
| Positioning: | GPS Navigation; vertically mounted video camera |
| Instrumentation: | Two split-beam cesium vapour magnetometers mounted at 13.4 m separation on a horizontal beam |
| Data Recorded: | Total field mag; horizontal gradient mag |
| Comments: | IGRF for year 2007.25 and 215 m altitude removed from Total Field Mag data to yield residual; derived first vertical derivative. As of Dec. 7, 2007, the final data are available, as are final PDF Maps, Residual Total Magnetic Field (GSC Open Files 5649-5651; GSNL Open Files NFLD/2952, 12H/1813, NFLD/2953) and Calculated Vertical Gradient of the Magnetic Field (GSC Open Files 5654-5656; GSNL Open Files NFLD/2955, 12H/1814, NFLD/2956), at 1:25 000 scale. |
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| - Digital Data - |
| Confidentiality Date: | June 14, 2007 |
| Grid Cell Size: | 20 m |
| Total Data Points: | 1702887 |
| Projection of Data: | NAD83, UTM Zone 21 |
| Data Comments: | Final copy of the digital data have been released Dec. 7, 2007. The maps supercede their preliminary versions, which were released in the Spring, 2007. |
| Links to Data: |
| Read-Me archive description |
| Interpolated grids, Geosoft format, NAD83 (9.5 Mb zip'd) |
| Profile archive, Geosoft database format (320 Mb zip'd) |
| Residual Magnetic Field Map, 1:50,000 - preliminary, PDF format (45.0 Mb) |
| First Vertical Derivative of Magnetic Field Map, 1:50,000 - preliminary, PDF format (67.3 Mb) |
| Residual Magnetic Field Map, 1:25,000 - South Block, PDF format (6.8 Mb) |
| Residual Magnetic Field Map, 1:25,000 - Central Block, PDF format (7.5 Mb) |
| Residual Magnetic Field Map, 1:25,000 - North Block, PDF format (7.1 Mb) |
| Calc. Vertical Gradient of Magnetic Field Map, 1:25,000 - South Block, PDF format (10.3 Mb) |
| Calc. Vertical Gradient of Magnetic Field Map, 1:25,000 - Central Block, PDF format (11.5 Mb) |
| Calc. Vertical Gradient of Magnetic Field Map, 1:25,000 - North Block, PDF format (10.7 Mb) |
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| GIS Layers: |
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